Não informado. (1981). Advances in Space Research. International Council of Scientific Unions, Committee on Space Research.
Lua i Stíl Chicago (17ú heag.)Não informado. Advances in Space Research. Oxford, Inglaterra: International Council of Scientific Unions, Committee on Space Research, 1981.
Lua MLA (8ú heag.)Não informado. Advances in Space Research. International Council of Scientific Unions, Committee on Space Research, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.